Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-11-18
1976-03-09
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 20CR, G01R 3112, G01R 3116, G01R 3122, H01J 942
Patent
active
039434389
ABSTRACT:
For use in the manufacture of a cathode ray tube, an apparatus for testing a hermetic, glass-like frit seal interposed between the funnel and faceplate of an in-process cathode ray tube. The inside walls of the funnel have a conductive coating adapted to receive test voltage which is applied to an anode button located on the wall of the funnel. A discontinuity in the hermetic seal causes a high voltage breakdown in the seal when the test voltage is applied to the cathode ray tube. The apparatus comprises an elastomeric band which is capable of being stretched over the tube, conforming to the shape of the hermetic seal between the funnel and faceplate. It further includes means for supporting and locating the cathode ray tube in a position such that the tube may be tested. The apparatus also comprises band mounting means which hold the elastomeric band and stretch the band to fit around the tube's hermetic seal such that the band forms intimate and uninterrupted electrical and mechanical contact with the frit seal. The apparatus further comprises means for applying a test voltage across the frit seal between the conductive coating and the elastomeric band. A method for testing the frit seal of a cathode ray tube is also disclosed.
REFERENCES:
patent: 2445808 (1948-07-01), Stenstrom
patent: 2471560 (1949-05-01), Everson et al.
patent: 2573815 (1951-11-01), Smith
patent: 2866156 (1958-12-01), Lane
patent: 2900597 (1959-08-01), Gooding
patent: 3015692 (1962-01-01), Herrington
patent: 3069620 (1962-12-01), Servos
patent: 3417327 (1968-12-01), Breidenbach
Barber Howard H.
Hajduk Thaddeus J.
Strecker Gerard R.
Zenith Radio Corporation
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